The only lubrication point on the Glock receiver is under the 'hook' of the connector. This is the most critical point to lubricate for keeping the trigger pull smooth. We recommend a white grease to be applied every few hundred rounds or so to avoid the gritty trigger pull.
Just remember not to get any oil inside the Glock firing pin channel. This sometimes happens when the slide is over lubricated and oil seeps in around the firing pin safety or the debris hole next to the stripper rail. Notice both in the picture above.
The 'hood' of the slide. Apply one or two drops of oil just to the left of the front sight screw and spread it to the left, towards the ejection port.
The slide has two lubrication points, the rails and the hood of the slide. Just apply a drop on each rail, with the muzzel pointed downward and let gravity allow the drops to run down to the front of the slide.
Then a couple of drops of oil on the barrel and smooth it out.
"GLOCK" is a federally registered trademark of GLOCK, Inc and is one of many trademarks owned by GLOCK, Inc. or GLOCK Ges.m.b.H. Neither RockYourGlock.com, LLC nor this site are affiliated in any manner with, or otherwise endorsed by, GLOCK, Inc. or GLOCK Ges.m.b.H. The use of "GLOCK" on this page is merely to advertise the sale of GLOCK pistols, parts, or components. For genuine GLOCK, Inc and GLOCK Ges.m.b.H. products and parts visit www.glock.com.